$sec^2\left(\theta\right)-csc^2\left(\theta\right)=1$
$\lim_{x\to\infty}\frac{0.15x}{x^2+3}$
$4-3y+3x-2x-y$
$3.5m^3n^2-4m^3n^2$
$\left(2p-q-3r\right)^2$
$\sec\left(a\right)\cdot\cos^2\left(a\right)$
$-x^3+x^2-x+1$
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